%I #5 Mar 31 2012 12:36:00
%S 252,1248,6132,30024,149112,736200,3618864,17994960,88970832,
%T 437998752,2179485792,10786403232,53164931904,264710389824,
%U 1311266615616,6470585244288,32236291820160,159828372581760,789588076184064
%N 1/12 the number of (n+2)X3 0..2 arrays with each 3X3 subblock containing one of one value, three of another, and five of the last
%C Column 1 of A184505
%H R. H. Hardin, <a href="/A184499/b184499.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n)=3*a(n-1)+12*a(n-2)+132*a(n-3)-432*a(n-4)-1620*a(n-5)-2052*a(n-6)+10692*a(n-7)+29160*a(n-8)+7776*a(n-9)-69984*a(n-10)-139968*a(n-11)
%e Some solutions with a(1,1)=0 for 4X3
%e ..0..2..1....0..2..1....0..0..1....0..1..0....0..2..0....0..2..2....0..2..1
%e ..0..1..0....0..1..0....0..2..1....0..2..0....1..1..0....2..0..2....2..2..2
%e ..0..0..1....0..1..0....1..0..0....0..2..2....1..0..0....0..1..2....0..2..0
%e ..1..2..0....1..2..0....0..0..1....2..2..1....2..0..0....0..0..0....2..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 16 2011
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